// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#pragma once

#include <cstdint>
#include <vector>

#include <turbo/strings/escaping.h>

namespace parquet::encryption {
    // In the double wrapping mode, each "data encryption key" (DEK) is encrypted with a “key
    // encryption key” (KEK), that in turn is encrypted with a "master encryption key" (MEK).
    // In a writer process, a random KEK is generated for each MEK ID, and cached in a <MEK-ID
    // : KEK> map. This allows to perform an interaction with a KMS server only once for each
    // MEK, in order to wrap its KEK. "Data encryption key" (DEK) wrapping is performed
    // locally, and does not involve an interaction with a KMS server.
    class KeyEncryptionKey {
    public:
        KeyEncryptionKey(std::string kek_bytes, std::string kek_id,
                         std::string encoded_wrapped_kek)
            : kek_bytes_(std::move(kek_bytes)),
              kek_id_(std::move(kek_id)),
              encoded_kek_id_(turbo::base64_encode(kek_id_)),
              encoded_wrapped_kek_(std::move(encoded_wrapped_kek)) {
        }

        const std::string &kek_bytes() const { return kek_bytes_; }

        const std::string &kek_id() const { return kek_id_; }

        const std::string &encoded_kek_id() const { return encoded_kek_id_; }

        const std::string &encoded_wrapped_kek() const { return encoded_wrapped_kek_; }

    private:
        std::string kek_bytes_;
        std::string kek_id_;
        std::string encoded_kek_id_;
        std::string encoded_wrapped_kek_;
    };
} // namespace parquet::encryption
